Pressure type lens tube for single lens reflex camera for incorporation in a follow-up type aperture-controlled camera

Abstract

A lens tube for a single-lens reflex camera having a plurality of aperture blades normally pressed in the aperture-enlarging direction comprises an interlocking member operably associated with the aperture blades, a limiting member for stopping the interlocking member to determine the position of the blades for providing a desired aperture, a release means provided in interlocked relation with the shutter mechanism on the camera body and an operating member actuated from the outside to operate the interlocking member until the interlocking member is stopped by the limiting member during the initial stage of operation and to thereafter operate the release means. The lens tube can be incorporated in the conventional follow-up type aperture-controlled camera.

I claim: 
     
       1. A lens tube for a single-lens reflex camera including a shutter mechanism on the camera body and having a plurality of aperture blades normally pressed in the aperture-opening direction, comprising, in combination, an interlocking member operably associated with said aperture blades for their displacement against the pressing force given them when the member is operated, a limiting member for stopping said interlocking member at a position corresponding to a predetermined aperture-setting operation to determine the position of said blades for a desired aperture, a release means provided in interlocked relation with the shutter mechanism to actuate the shutter mechanism, and an operating member operable from the outside of the lens tube to actuate said interlocking member until the interlocking member is stopped by said limiting member during the initial stage of operation and to thereafter operate said release means, said release means being interlocked with said operating member for transmitting a release signal after aperture setting, said interlocking member, limiting member, release means and operating member being positioned in the lens tube. 
     
     
       2. A lens tube as set forth in claim 1, further including a manual aperture-operating member having an operating portion operable from the outside of said lens tube and adapted to move said interlocking member until the interlocking member is stopped by said limiting member when the operating member is operated. 
     
     
       3. A lens tube as set forth in claim 2, wherein the operating portion of said manual aperture-operating member is mounted for rotation in said lens tube to turn together with an aperture ring adapted to set the aperture at a selected value. 
     
     
       4. A lens tube for a single-lens reflex camera including a shutter mechanism on the camera body and having a plurality of aperture blades normally pressed in the aperture-opening direction, comprising, in combination, an aperture ring rotatably mounted on said lens tube for setting the aperture at a selected value, an interlocking member operably associated with said aperture blades for their displacement against the pressing force given them when the member is operated, a limiting member interlocked with said aperture ring to stop said interlocking member at a position corresponding to a predetermined aperture-setting operation to determine the position of said blades for a desired aperture, and a manual aperture-operating member operable outside the lens tube having an operating portion rotatable with said aperture ring to actuate said interlocking member until the interlocking member is stopped by said limiting member.